Folks have been using Next.js this way for many years, and it has been documented, but not as clearly as we could have been. So the answer is, yes! There are no plans to ever deprecate client-side usage. We believe it's important to use the best parts of both the client and the server, not just one.
> We believe it's important to use the best parts of both the client and the server, not just one.
And many believe they do not need server-side JavaScript at all. We just need an SPA to speak to our API. We do not need "best of both worlds". Next is just more complexity over plain old client-side React. That's why some people including me are looking for alternatives to React recently. Next is not what we want or need.